Perhaps you should try some spelling variations:
dau tieng » dau tien, cau tieng, day tieng
toan cau » toan cao, toan ban, toan tap
tinh vai » tinh va, tinh hai, tinh bai
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
van hau » van ha, van hai, van dau
va tinh » may tinh
vai dau » va dau, van dau, xvii dau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang xa hoi. hieu ((van cam) or (((toan cau) or (van hau)))) tu va tinh vai dau tieng~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang xa hoi. hieu ((van cam) OR (((toan cau) OR (van hau)))) tu va tinh vai dau tieng.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang xa hoi. hieu ((van cam) or (((toan cau) or (van hau)))) tu va tinh vai dau tieng*.